Experimental analysis of turbulent structure of viscoelastic fluid flow in downstream of two-dimensional orifice

Tsurumi, D.; Kawada, Shinya; Kawase, Tomohiro; Tsukahara, Takahiro; Kawaguchi, Yasuo

doi:10.1615/ichmt.2012.procsevintsympturbheattransfpal.2440

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“…Relevant previous studies on viscoelastic turbulent flow: Exp., experiment; Sim., numerical simulation. using PIV (particle image velocimetry) [50]. Figure 1 shows the instantaneous velocity vectors in a plane of interest.…”

Section: Related Studiesmentioning

confidence: 99%

Turbulent Flow of Viscoelastic Fluid Through Complicated Geometry

Tsukahara¹,

Kawaguchi²

2012

Viscoelasticity - From Theory to Biological Applications

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Section: Related Studiesmentioning

confidence: 99%

Turbulent Flow of Viscoelastic Fluid Through Complicated Geometry

Tsukahara¹,

Kawaguchi²

2012

Viscoelasticity - From Theory to Biological Applications

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Asymmetrical Velocity Distribution in the Drag-Reducing Channel Flow of Surfactant Solution Caused by an Injected Ultrathin Water Layer

Liang

Zhang³

2020

Symmetry

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Although the turbulent intensity is suppressed in the drag-reducing channel flow by viscoelastic additives, the mean velocity distribution in the channel flow is symmetrical and tends to be similar to the laminar flow. In the study of near-wall modulation of the drag-reducing flow with an injected ultrathin water layer, an asymmetrical mean velocity distribution was found. To further investigate this phenomenon and the underlying cause, an experiment was carried out with the water injected from a porous channel wall at a small velocity (~10−4 m/s) into the drag-reducing flow of surfactant solution. The instantaneous concentration and flow fields were measured by using planar laser-induced fluorescence (PLIF) and particle imaging velocimetry (PIV) techniques, respectively. Moreover, analyses on turbulent statistical characteristics and spatial distribution of viscoelastic structures were carried out on the basis of comparison among various flow cases. The results showed that the injected ultrathin water layer under present experimental conditions affected the anisotropy of the drag-reducing flow. The characteristics, such as turbulence intensity, showed the zonal feature in the wall-normal direction. The Reynolds shear stress was enhanced in the near-wall region, and the viscoelastic structure was modified severely due to the redistributed stress. These results may provide experimental supports for the near-wall modulation of turbulence and the exploration of the drag-reducing mechanism by viscoelastic additives.

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Experimental analysis of turbulent structure of viscoelastic fluid flow in downstream of two-dimensional orifice

Cited by 2 publications

References 0 publications

Turbulent Flow of Viscoelastic Fluid Through Complicated Geometry

Turbulent Flow of Viscoelastic Fluid Through Complicated Geometry

Asymmetrical Velocity Distribution in the Drag-Reducing Channel Flow of Surfactant Solution Caused by an Injected Ultrathin Water Layer

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